Hybrid Precoding with True-Time-Delay for Terahertz Near-Field Ultra-Massive Antenna Arrays
To address the severe path loss, wideband beam squint effect, and near-field spherical wave propagation chal-lenges in Terahertz (THz) ultra-massive multiple-input multipleoutput (UM-MIMO) systems for 6G communications in this paper, we propose a true-time-delay (TTD)-assisted near-field wideband hybrid precoding schem...